Seasonable temperatures will feel much colder Saturday as a windchill effect creeps over Long Island, local meteorologists said.

A northwesterly wind will be blowing from 15 to 20 mph with gusts to 30 mph, said Tim Morrin, a meteorologist with the weather service’s Upton bureau. Temperatures Saturday are expected to reach 48 degrees, on par with the normal temperature for this time of year at Long Island MacArthur Airport, Morrin said, but the winds will make it feel as if its in the 30s.

“For today, the good news is that we’ll have bright, bright sunny conditions,” Morrin said. “Temperatures are pretty much spot-on average, right where they should be for this date. But there will be a windchill effect today. It’s probably a good idea to layer some outer layers of clothing before going outside.”

Saturday night will be a clear, starry night, Morrin said, as temperatures drop below freezing and are expected to hit the 30 degree mark.

Justin Godynick, a meteorologist with News 12 Long Island, said a cold front cleared the way for high winds over the Island.

“Overnight, temperatures will be quite chilly, in the upper 30s,” Godynick said. “Stick the wind in with that and it feels like the mid-20s.”

Morrin said the high winds will diminish as the night wears on, “but we’ll still have a noticeable breeze.”